| Country | Action | Action Date | Effective Date |
|---|
| Antilles | Extension | 01/01/1986 | |
| ARGENTINE REPUBLIC | Signature | 18/10/1907 | |
| Aruba | Extension | 01/01/1986 | |
| AUSTRIA-HUNGARY | Ratification | 27/11/1909 | |
| BELGIUM | Ratification | 08/08/1910 | |
| BOLIVIA | Signature | 18/10/1907 | |
| BRAZIL | Ratification | 05/01/1914 | |
| BULGARIA | Signature | 18/10/1907 | |
| CHILE | Signature | 18/10/1907 | |
| CHINA | Accession | 10/05/1917 | |
| COLOMBIA | Signature | 18/10/1907 | |
| CUBA | Signature | 18/10/1907 | |
| DENMARK | Ratification | 27/11/1909 | |
| DOMINICAN REPUBLIC | Signature | 18/10/1907 | |
| ECUADOR | Signature | 18/10/1907 | |
| ETHIOPIA | Accession | 05/08/1935 | |
| FIJI | Succession | 02/04/1973 | |
| FINLAND | Accession | 09/06/1922 | |
| FRANCE | Ratification | 07/10/1910 | |
| GERMANY | Ratification | 27/11/1909 | |
| GREECE | Signature | 18/10/1907 | |
| GUATEMALA | Ratification | 15/03/1911 | |
| HAYTI | Ratification | 01/01/1910 | |
| ITALY | Signature | 18/10/1907 | |
| JAPAN | Ratification | 13/12/1911 | |
| LIBERIA | Accession | 04/02/1914 | |
| LITHUANIA | Def EIF | 11/11/2004 | 09/01/2005 |
| LUXEMBOURG | Ratification | 05/09/1912 | |
| MADAGASCAR | Accession | 13/09/2009 | 06/12/2009 |
| MEXICO | Ratification | 27/11/1909 | |
| NETHERLANDS THE | Ratification | 27/11/1909 | |
| NETHERLANDS THE | Declaration | 01/01/1986 | |
| NETHERLANDS THE | Declaration | 18/10/2010 | |
| NICARAGUA | Accession | 16/12/1909 | |
| NORWAY | Ratification | 19/09/1910 | |
| PANAMA | Ratification | 11/09/1911 | |
| PARAGUAY | Signature | 18/10/1907 | |
| PERSIA | Signature | 18/10/1907 | |
| PERU | Signature | 18/10/1907 | |
| POLAND | Accession | 31/05/1935 | |
| PORTUGAL | Ratification | 13/04/1911 | |
| ROUMANIA | Ratification | 01/03/1912 | |
| SALVADOR | Ratification | 27/11/1909 | |
| SERBIA | Signature | 18/10/1907 | |
| SIAM | Signature | 18/10/1907 | |
| SIAM | Ratification | 12/03/1910 | |
| SOUTH AFRICA | Succession | 10/03/1978 | |
| SPAIN | Ratification | 18/03/1913 | |
| SWEDEN | Ratification | 29/11/1909 | |
| SWITZERLAND | Ratification | 12/05/1910 | |
| TOGO | Def EIF | 18/10/2004 | 17/12/2004 |
| TURKEY | Signature | 18/10/1907 | |
| UNITED KINGDOM | Signature | 18/10/1907 | |
| UNITED KINGDOM | Ratification | 27/11/1909 | |
| UNITED STATES OF AMERICA | Ratification | 27/11/1909 | |
| URUGUAY | Signature | 18/10/1907 | |
| VENEZUELA | Signature | 18/10/1907 | |